Laminated Ceramic Capacitor Layout for Low-Temperature Densification
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Solution Overview
Problem
Conventional laminated ceramic capacitors face a trade-off where the addition of sintering agents reduces capacitance due to their lower relative permittivity, while insufficient sintering agent addition leads to inadequate densification of ceramic layers during low-temperature firing.
Innovation Solution
A laminated ceramic capacitor design with internal electrode layers and ceramic layers that include segregated parts containing a sintering agent element, where the ratio of segregated area to total electrode area is controlled to minimize capacitance reduction, and the sintering agent promotes densification even at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the amount of sintering agent added is increased, then the densification of ceramic layers is improved, but the capacitance is reduced
Solution Approach 1:
The sintering agent is selectively concentrated in segregated parts (non-electrode regions) rather than being uniformly distributed throughout the ceramic layer. This local concentration approach allows the sintering agent to perform its densification function in specific areas without reducing the overall capacitance, as the segregated parts do not contribute to capacitance generation.
Solution Approach 2:
The ceramic layer is functionally segmented into electrode parts (contributing to capacitance) and non-electrode parts (containing segregated sintering agent). This segmentation allows different regions to serve different purposes: the electrode parts maintain high capacitance while the non-electrode parts provide densification support through concentrated sintering agent.
2Quantity of substance
If the amount of sintering agent added is decreased, then the capacitance is maintained, but the densification of ceramic layers is insufficient
Solution Approach 1:
Instead of uniformly distributing a large amount of sintering agent throughout the ceramic layer (which would reduce capacitance), the invention concentrates the sintering agent in segregated non-electrode parts. This local quality approach ensures sufficient densification support with minimal overall sintering agent content, thereby maintaining capacitance.
3Temperature
If sintering agent is added to ceramic green sheets, then low-temperature firing is enabled, but the relative permittivity is reduced due to lower permittivity of sintering agent
Solution Approach 1:
The ceramic layer is segmented into electrode parts and non-electrode parts, with the sintering agent segregated to the non-electrode parts. This segmentation allows low-temperature firing to be enabled by the sintering agent while minimizing its impact on relative permittivity, as the sintering agent is confined to regions that do not contribute to capacitance.
Solution Approach 2:
The sintering agent is placed in segregated parts with local quality different from the electrode parts. This allows the sintering agent to facilitate low-temperature firing without significantly reducing the overall relative permittivity of the ceramic capacitor, since the segregated parts occupy minimal volume and do not participate in capacitance generation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design maintains higher capacitance by optimizing the distribution and concentration of sintering agent elements within the ceramic layers, ensuring effective densification and reduced electric field concentration, thereby extending the service life of the capacitor.
Implementation Method 1
addition of a sintering agent to the ceramic green sheets can promote the sintering of the ceramic powder through a low-temperature firing process
Implementation Method 2
Examples of known sintering agents include Si (silicon), which forms the liquid phase during the firing process
Implementation Method 3
a laminated ceramic capacitor having a capacitance less reduced by a sintering agent
Data Source
AI summary
Provided is a laminated ceramic capacitor having a capacitance less reduced by a sintering agent. A laminated ceramic capacitor according to one aspect includes a body having first and second internal electrode layers and a ceramic layer disposed therebetween. The ceramic layer is formed from ceramic material containing a sintering agent composed mainly of a sintering agent element. The first internal electrode layer includes a first electrode part and a first non-electrode part. The second internal electrode layer includes a second electrode part and a second non-electrode part. The first and second non-electrode parts each have a segregated part containing the sintering agent element. In a cross-section of the body, a ratio of a second area to a first area is 35% or lower, the first area representing a sum of areas of the first and second internal electrode layers, the second area representing an area of the segregated part.